[FIX] comments: Restore author user's avatar if prefs.comments_notitle and generally fixed tpl and CSS to lay out better in both modes and look generally cleaner.
I also shortened the "Comment posted by..." appearing before every comment to just "By..." and added a "Comments" title at the top of the comment-container (and moved the rather lost looking lock icon over the right where all the other "action" icons are).

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48258 b456876b-0849-0410-b77d-98878d47e9d5